G - Physics – 01 – M
Patent
G - Physics
01
M
73/53
G01M 11/02 (2006.01) H04B 10/08 (2006.01)
Patent
CA 1216168
17 A b s t r a c t A method in signal processing of a train of pulses with a stable, high repetition frequency fr, in par- ticular in connection with dispersion measurements of optical fibers, comprises sampling (1) of the received signal at a sampling frequency fs, where Image (n is an integer and .DELTA.f is several magnitudes smaller than fr). When the sampling frequency is generated by a pulse generator (3), which, through a phase-detecting circuit (4), depends on partly a reference signal (from the oscillator 6) and partly a low frequency sig- nal derived (via 5) From the signal received and sampled at the frequency fs, a stable sampling fre- quency is obtained even though the signal/noise ratio on the input of the receiver is significantly smaller than was permissible in the past. When the method is to be carried out within a relatively narrow repeti- tion frequency range, the oscillator (6) is preferably replaced by a frequency dividing circuit designed to generate a reference signal by division of the sampling frequency.
433187
Aktieselskabet Nordiske Kabel- Og Traadfabriker
Kirby Eades Gale Baker
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